Amazon calculates a product’s star ratings based on a machine learned model instead of a raw data average. The model takes into account factors including the age of a rating, whether the ratings are from verified purchasers, and factors that establish reviewer trustworthiness.
Great supplement to the Advancemos textbook! My son needed this workbook to supplement his Advancemos textbook and he will begin work in it this week. I looked over it and have determined that it will be very useful for him in learning Spanish. The pages are perforated, shrink-wrapped, and the package comes with laminated unit vocabulary study "cards."